revision-id: bb28bffc3ed179a9912aced2b873e43999111887 (mariadb-10.4.11-642-gbb28bff) parent(s): ddddfc33c7825609a25ce9531183a0b0fb97f206 author: Igor Babaev committer: Igor Babaev timestamp: 2021-06-07 19:51:57 -0700 message: Ported the test case for MDEV-25682 from 10.2 No fix for this bug is needed starting from version 10.4. --- mysql-test/main/order_by.result | 25 +++++++++++++++++++++++++ mysql-test/main/order_by.test | 16 ++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/mysql-test/main/order_by.result b/mysql-test/main/order_by.result index 826daf0..129bd89 100644 --- a/mysql-test/main/order_by.result +++ b/mysql-test/main/order_by.result @@ -3536,6 +3536,31 @@ SET max_length_for_sort_data=@save_max_length_for_sort_data; SET max_sort_length= @save_max_sort_length; SET sql_select_limit= @save_sql_select_limit; DROP TABLE t1; +# +# MDEV-25682: EXPLAIN for SELECT with ORDER BY after [ORDER BY] LIMIT +# +create table t1 (a int); +insert into t1 values (3), (7), (1); +explain (select a from t1 limit 2) order by a desc; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using filesort +2 DERIVED t1 ALL NULL NULL NULL NULL 3 +(select a from t1 limit 2) order by a desc; +a +7 +3 +create table t2 (a int, b int); +insert into t2 values (3,70), (7,10), (1,40), (4,30); +explain (select b,a from t2 order by a limit 3) order by b desc; +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY <derived2> ALL NULL NULL NULL NULL 3 Using filesort +2 DERIVED t2 ALL NULL NULL NULL NULL 4 Using filesort +(select b,a from t2 order by a limit 3) order by b desc; +b a +70 3 +40 1 +30 4 +drop table t1,t2; # End of 10.2 tests # # MDEV-16214: Incorrect plan taken by the optimizer , uses INDEX instead of ref access with ORDER BY diff --git a/mysql-test/main/order_by.test b/mysql-test/main/order_by.test index 1bf353f..0bf0311 100644 --- a/mysql-test/main/order_by.test +++ b/mysql-test/main/order_by.test @@ -2294,6 +2294,22 @@ SET max_sort_length= @save_max_sort_length; SET sql_select_limit= @save_sql_select_limit; DROP TABLE t1; +--echo # +--echo # MDEV-25682: EXPLAIN for SELECT with ORDER BY after [ORDER BY] LIMIT +--echo # + +create table t1 (a int); +insert into t1 values (3), (7), (1); +explain (select a from t1 limit 2) order by a desc; +(select a from t1 limit 2) order by a desc; + +create table t2 (a int, b int); +insert into t2 values (3,70), (7,10), (1,40), (4,30); +explain (select b,a from t2 order by a limit 3) order by b desc; +(select b,a from t2 order by a limit 3) order by b desc; + +drop table t1,t2; + --echo # End of 10.2 tests --echo #